Which innovative book format, first widely introduced in the 1930s, made literature more affordable and accessible to the masses through a revolutionary distribution model?

Throughout history, innovations in how literature is packaged and delivered have transformed reading experiences and expanded audience reach. From scrolls to bound codices, from mass-market paperbacks to digital e-readers, the 'product format' of books has constantly evolved. This trivia tests your knowledge about a significant product innovation that changed how people accessed and consumed literature in the 20th century.

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Penguin Paperbacks, which standardized affordable quality paperbacks sold in non-traditional locations like drugstores
Library of America hardcovers, which created subscription-based collector editions of classic works
Book-of-the-Month Club selections, which pioneered the mail-order book delivery service
Little Golden Books, which created child-sized, illustrated books with reinforced bindings